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Enumeration of curves with one singular point

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arxiv 1308.2902 v3 pith:IM6NOYTB submitted 2013-08-13 math.AG math.AT

classification math.AGmath.AT
keywords curvesclassgenericnumberalgebraicbundleclassicalcodimension
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In this paper we obtain an explicit formula for the number of degree d curves in two dimensional complex projective space, passing through (d(d+3)/2 -k) generic points and having a codimension k singularity, where k is at most 7. In the past, many of these numbers were computed using techniques from algebraic geometry. In this paper we use purely topological methods to count curves. Our main tool is a classical fact from differential topology: the number of zeros of a generic smooth section of a vector bundle V over M, counted with a sign, is the Euler class of V evaluated on the fundamental class of M.

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  1. Counting curves in a linear system with upto eight singular points

    math.AG 2019-09 conditional novelty 7.0 of 10

    The authors derive recursive Euler class formulas that enumerate curves with δ nodes and one fixed singularity for all δ+k ≤ 8, recovering prior results and producing new codimension eight numbers.

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